It's pronounced just like the English word "hello".
Here are some other options, depending on the context:
* "Sut mae?" (pronounced "soot my") - This is a more formal way to say hello, similar to "How are you?".
* "Bore da" (pronounced "bor-eh dah") - This means "good morning".
* "Prynhawn da" (pronounced "pri-noon dah") - This means "good afternoon".
* "Nos da" (pronounced "nos dah") - This means "good evening" or "good night".